17 replies to this topic

[pdaykin]

I seem to remember that someone one produced hollow subframe tower bolts.

 

Am I imagining it ?

 

If not, does anyone have the details for who it was ?

[nicklouse]

not hollow but light.

http://www.dsnclassi...ist-components/

 cant think who did the hollow ones.

[domdee]

some one is selling some on here.

 

I think the tread is called Titanium parts or someithing along that line. its an ebay link.

 

Centres of the bolts are 'hollow'.

[domdee]

http://www.theminifo...titanium +parts

 

wasn't far off with the name haha

[domdee]

sorry looks like thay are sold now

[Will16]

There's a few guys on build threads who have hollowed them out, this is the one that springs to mind though the pictures aren't working for me

http://www.theminifo...-clubman/page-3

Also there's this guy who made some from scratch out of titanium, proper fabrication!

http://www.theminifo...t-measurements/

[panky]

https://www.ebay.co....hUAAOSwAaJaNEcJ

[pdaykin]

Cheers

[mk1leg]

there were some with holes drilled through for the HiLo adjustable with a 2ft long Allen key

[pdaykin]

That's what I was really after

Speed bumps are causing me real problems

I was hoping for more convenience

[Retroman]

That's what I was really after

Speed bumps are causing me real problems

I was hoping for more convenience

Pm me, I have a pair, standard type drilled

[PIIIOWW]

Does anyone know the size of the drill holes? I dropped some bolts off at an engineering workshop today for drilling out. It'd be nice to know the required size and maintain the maximum bolt strength.

Edited by PIIIOWW, 17 January 2018 - 08:06 AM.

[Dusky]

Id drill it to 11.5-12mm max. Given its a 3/4unf bolt wich uses a 17.5mm drill hole according to my cheat sheet. Leaving a 3mm should be ample I think. As the subframe ltself is only 16gauge metal iirc. Though,personaly id never drill this, not worth the 200 gram weight loss for me

Edited by Dusky, 18 January 2018 - 08:02 PM.

[Cooperman]

It is only really worth it if you need to regularly compress the rubber cone springs.

[carbon]

Is drilling all the way through the tower bolt sensible? It may be sized at 3/4UNF for a good reason, and a 12mm hole all the way through the middle will make it weaker.

 

If you drill it out to 14mm (enough to get a 14mm thread through for cone compressor) then it will be way too thin.

 

If you're running all solid mounts for the front subframe then might be possible to lose weight by machining the outer part between the thread and the bolt head, bring the diameter down close to the 3/4 UNF thread root diameter (17.5mm), but leaving a small lip at top under the bolt head to locate the alloy spacer ring.